Retrieve dashboard configurations in AngularJS by making an $http request prior to initiating the dashboard controller

Question

Retrieve dashboard configurations in AngularJS by making an $http request prior to initiating the dashboard controller

I am currently immersing myself in Angular and tackling a complex dashboard framework all built with Angular. Prior to loading the controllers, I need to fetch various dashboard settings from the server using $HTTP. These settings play a crucial role in determining the layout of the dashboards. According to my understanding, Angular builds by executing config methods first, followed by run methods, and then the controllers. Unfortunately, $HTTP cannot be used in a config method, so I have incorporated it into my main.js:

    MetronicApp.run(['$rootScope','$http', function($rootScope,$http) {

  var CUID = Cookies("CUID");
  console.log('portlet settings for '+ CUID);
   $http.get('/myurl/V3_portlet_settings?p_user_id='+CUID)
        .then(function(response) {
            console.log(response.data);
            console.log('portlet status: ' + response.status);
            $rootScope.$broadcast("dashSettings",response.data);
        });

}]);

Upon running, everything functions smoothly and I can view the data in the console.

Subsequently, in my controller:

$scope.$on( "dashSettings", 
function(event,data){
    $scope.dData = data;
     console.log('dash data service identified in dash controller');
     console.log($scope.dData.count);
    } );

Now, I have a couple of questions:

Is this the most effective approach for retrieving settings before initializing the dashboard? My intention is to integrate the dash-building calls within my $scope.$on block. I started exploring how to execute a run method synchronously prior to initializing the controllers, but perhaps it's unnecessary.
Any insights as to why the $scope.$on method may not be triggering?

Thank you in advance

javascript angularjs

Answer 1

Answer №1

One effective strategy is to organize your $http functions within a service or factory and then resolve them in your controller. The use of promises plays a crucial role in this approach, as outlined in Angular's documentation:

A service that helps you execute functions asynchronously and handle their return values (or exceptions) upon completion

To start, create a service like so:

app.factory('DataService', function($http) {
  var getValues= function() {
    var url = '/myurl/V3_portlet_settings?p_user_id='+ CUID;
    return $http.jsonp(url); // returns a promise
  };

  return {
    getValues: getValues
  };
});

Then, utilize the service in your controller:

myApp.controller('MyController', function ($scope, DataService) {     
    DataService.getValues().then( // resolve the promise using .then()
    function(data){
      // success callback
      // now you can safely handle the data in your controller
      console.log(data);
    },
    function(error){
      // error callback
      console.log(error);
    })   
});

Utilizing data services for managing data operations such as $http requests is generally considered a best practice.
The ability to chain promises and effectively manage asynchronous calls via promise return enhances the overall workflow.

Check out John Papa's style guide for further insights, particularly the sections on 'Separate Data Calls' (Y060) and 'Return a Promise from Data Calls' (Y061)

Answer 2

One effective strategy is to organize your $http functions within a service or factory and then resolve them in your controller. The use of promises plays a crucial role in this approach, as outlined in Angular's documentation:

A service that helps you execute functions asynchronously and handle their return values (or exceptions) upon completion

To start, create a service like so:

app.factory('DataService', function($http) {
  var getValues= function() {
    var url = '/myurl/V3_portlet_settings?p_user_id='+ CUID;
    return $http.jsonp(url); // returns a promise
  };

  return {
    getValues: getValues
  };
});

Then, utilize the service in your controller:

myApp.controller('MyController', function ($scope, DataService) {     
    DataService.getValues().then( // resolve the promise using .then()
    function(data){
      // success callback
      // now you can safely handle the data in your controller
      console.log(data);
    },
    function(error){
      // error callback
      console.log(error);
    })   
});

Utilizing data services for managing data operations such as $http requests is generally considered a best practice.
The ability to chain promises and effectively manage asynchronous calls via promise return enhances the overall workflow.

Check out John Papa's style guide for further insights, particularly the sections on 'Separate Data Calls' (Y060) and 'Return a Promise from Data Calls' (Y061)

Retrieve dashboard configurations in AngularJS by making an $http request prior to initiating the dashboard controller

Answer №1

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